Attack Allegedly Involving 12-Year-Olds Has Experts at Odds

A case of two 12-year-old girls who allegedly lured a middle-school friend into the Wisconsin woods and stabbed her repeatedly before leaving her for dead has reignited a debate about the potentially damaging influence of the Internet on children, with local police calling it a "wake-up call for parents."

The two girls, who have been charged with attempted murder as adults, told authorities they carried out the crime to...